Method for recovering cobalt from zinc-cobalt-nickel slag purified by zinc hydrometallurgy

Abstract

The invention discloses a method for recovering cobalt from purified zinc-cobalt-nickel slag in zinc hydrometallurgy, which comprises the following steps: providing purified zinc-cobalt-nickel slag; preparing a leaching pre-solution with a certain acid concentration, heating the leaching pre-solution, then adding the purified zinc-cobalt-nickel slag to carry out a primary acid leaching reaction, and filtering to obtain a primary acid-leached post-solution and primary acid-leached slag; and after the primary acid leaching post-liquid is heated, ammonium salt or sodium salt is added for an oxidation reaction, and cobalt concentrate and cobalt-removed post-liquid are obtained after filtering. And the primary acid leaching residue is continuously subjected to secondary acid leaching reaction. Cyclic enrichment of cobalt in the system during purification slag treatment through a conventional method is avoided, unit consumption of zinc powder is reduced, the cobalt recovery rate is increased, high-grade cobalt concentrate is obtained, and the cobalt content of the cobalt concentrate is 23%-26%. The method provided by the invention is simple to operate, the process is easy to control, the cobalt content of the obtained cobalt concentrate is relatively high, cobalt in the purified slag is recycled to the maximum extent, the value of valuable metals is improved, and quality improvement and efficiency improvement are realized.

Description

technical field [0001] The invention relates to the field of non-ferrous metal smelting, in particular to a method for recovering cobalt from zinc-cobalt-nickel slag purified by hydrometallurgy. Background technique [0002] In the process of zinc hydrometallurgy, the supernatant produced by neutral leaching of zinc calcine contains copper, cadmium, cobalt, nickel and other impurity elements. In order to meet the quality requirements of zinc electrowinning solution, the impurities are purified to obtain qualified The zinc sulfate solution is sent to the zinc electrowinning system. The antimony salt purification method is currently the most widely used purification method in the world. During the purification and cobalt removal process, the cobalt in the solution is removed by adding an antimony activator to obtain a purification slag containing Zn-Co-Ni. The purification slag contains high zinc content. In order to recover the zinc, the Zn-Co-Ni purification slag is pickled...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for recovering cobalt from zinc-cobalt-nickel slag purified by zinc hydrometallurgy, aiming at solving the difficulty of cobalt recovery in existing zinc-cobalt-nickel slag purified by zinc hydrometallurgy The problem